A custom made 8 gal welded plastic tank with 1/2" vent and two 1.5" fittings was about $80 three years ago.

Just an FYI - I just paid $325 for a custom 12 gl that fits into the lower radius of the forward section. Which came with (2) 1-1/2" NPT-F fitting on top w/a down tube. a 3" inspection cover and a 3/4" NPT-F for the vent. A very heavy construction for Raritan. They included an elbow and adaptor for running the hoses from the down (extraction) tube.

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__________________Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!
Unprepared boaters, end up as floatsum!.......

Check with Barr plastics in Abbotsford, they specialize in plastic marine tank fabrication. If you get down to the Vancouver Boat Show, Barr is usually exhibiting there and you could discuss your project in person.

Ouch! That has to be a Ronco tank...that's who supplies at least 90% of Raritan's tanks...you've shown just how much Raritan marks up the price!

I figure with the custom shape (half of a half moon) and the materials, 4 fittings, a down tube and putting it all together is well worth it, considering it would take me more then a 8 hour day to cut it out and piece it together and the cost of logistics to get it all together. That's what a business is for, right! To have all that stuff on hand. It only took 6 days to get it.

$325 would only fill my truck tank 3 times. I spend that much just in fuel driving to/from the boat each month, in the spring/summer.

__________________Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!
Unprepared boaters, end up as floatsum!.......